Διάλεξη Καθηγητή Τ. Μούντζιαρη, 27-5-2015
ΔΙΑΛΕΞΗ
Synthesis, Optimization and Applications
οf Compound Semiconductor Nanostructures
Professor Triantafillos J. Mountziaris*
Department of Chemical Engineering
University of Massachusetts
Amherst, MA 01003, USA
Tετάρτη, 27/5/2015, ώρα 1:00 μμ
Αίθουσα “Κουμούτσου” Σχολής Χημικών Μηχανικών
Περίληψη: This seminar will focus on the design and optimization of reactors used for epitaxial growth of compound semiconductor thin films and for template-assisted growth of compound semiconductor nanocrystals. Compound semiconductor thin films and multi-layer structures based on them form the basis of modern optoelectronic devices, such as quantum-well lasers and optical detectors. The design of reactors for the epitaxial growth of single-crystalline films with uniform thickness and composition over large-area substrates is a challenging problem, due to the underlying complex transport phenomena that are coupled with gas-phase and surface reactions. We will discuss the design and optimization of vertical rotating-disc reactors used for metalorganic vapor-phase epitaxy of compound semiconductors and the development of generalized design criteria for recirculation-free flows that are necessary for growing multilayer structures with atomically-abrupt interfaces. Predictions from numerical simulations of laboratory- and industrial-scale reactors will be compared to experimental data.
The second part of this seminar will focus on the synthesis and surface functionalization of semiconductor nanocrystals. These materials have unique properties, including size-tunable photoluminescence, narrow emission and broad absorption spectra, high quantum yields, large extinction coefficients, and excellent photochemical stability. They have numerous potential applications in medical diagnostics, display technologies and solar energy conversion. We will discuss a scalable technique that employs microemulsions and liquid crystals as templates for growing nanocrystals of compound semiconductors with precise control on size, shape and size distribution of the resulting nanostructures. The focus will be on the synthesis of heavy-metal-free nanocrystals, such as ZnSe and ZnSe/ZnS core/shell structures, and their doping with Mn2+ and Cu2+ ions. Surface functionalization and applications of these materials in a new class of optical biosensors that allow rapid simultaneous detection of multiple biomolecular targets and are suitable for portable point-of-care diagnostic devices will be discussed.
Oσοι ενδιαφέρονται για συνάντηση με τον ομιλητή, να επικοινωνήσουν με τον Καθ. Ανδρέα Μπουντουβή, τηλ. 210-7723241, boudouvi@chemeng.ntua.gr